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1 of 7 <br /> LONGITUDE <br /> ONE TWENTYO <br /> ENGINEERING&DESIGN <br /> Helical/Concentric Pile Re-Inspection Verification Review for Structural Compliance <br /> Date: July 9, 2024 <br /> Project Name: 4330 Colby Ave . - Foundation Stabilization Effort L120 Project#S220725-3XR <br /> Project Location:4330 Colby Ave., Everett, WA, 98203 <br /> Client's Name:Alesha Stickles, Project Coordinator—R&R Foundation Specialist, LLC <br /> To Whom It May Concern: <br /> The purpose of this letter is to confirm pile installation and capacity compliance with the structural <br /> requirements specified in the L120 Structural Calculation Package and Structural Site Plan dated <br /> November 13, 2022. <br /> On April 18, 2023,thirteen (13) helical piles were installed by R&R Foundation Specialists (R&R)to <br /> stabilize areas of the single-family residence located at 4330 Colby Ave, Everett, WA 98203. Helical Piles <br /> were installed with a Digga 10K drive head with a maximum depth of 13ft, by R&R certified installers in <br /> accordance with the cited structural package and ESR-3750. <br /> On June 21st, 2024,to align with jurisdiction requirements,the FOR from L120 Engineering and Design <br /> provided an on-site re-inspection where a single installed test pile (Helical Pile#7) was load tested to be <br /> in compliance with the minimum required loading for the typical piles as specified in the structural <br /> calculations. During the re-inspection testing, it was observed that the test pile reached test pressures <br /> equivalent to a load capacity of 10.5kips before the existing structure showed signs of lifting, at which <br /> point the testing was halted. As can be seen by the initial installation drive logs (attached for reference), <br /> pressures equivalent to a minimum 15.7kips were achieved for the helical pile#7 location during initial <br /> driving of piles. By inspection, it can be seen in both the initial installation results and the re-tested pile <br /> results that the pile capacity of the installed pile exceeds the maximum loading demand of pile#7 and <br /> typical piles, as determined by L120's analysis.Therefore, the installed pile(s) complies with the <br /> structural design/demand. <br /> 0. ••• 0B <br /> LUOEngineering.com <br />